Rogers kit any good?
 

"Keith G" wrote


Yes, I've got a picture of a whole stack of them in some 'busines park
emporium' somewhere - quite flimsy by proper carpet standards, therefore
not too heavy to hang up and quite cheap. The patterns were very good
(Turkish/Persian style) and there were enough colour variations to make
them suitable!


Make that 'mental picture'...!!

Rogers kit any good?
 

Keith G wrote:
"Jim Lesurf" wrote in message
...
In article , Keith G
wrote:


Hah! Funny you should say that - I'm definitely getting to the point
where, once I've settled on the speakers, I need to get summat up on
the walls and shut the room down a bit! Your suggestions in that
department would be more than handy, I reckon!! I've been pondering one
or two of those flimsy, patterned carpets (mats?) you see in heaps in
garden centres and suchlike to hang on the walls...???
FWIW My experience is that something like a rug hung on the walls can
improve the room acoustic quite markedly. Preferrably hung from something
like a curtain pole so it hangs a few inches away from the wall. Can also
look very nice if you choose a rug with a suitable pattern.


Yes, I've got a picture of a whole stack of them in some 'busines park
emporium' somewhere - quite flimsy by proper carpet standards, therefore not
too heavy to hang up and quite cheap. The patterns were very good
(Turkish/Persian style) and there were enough colour variations to make them
suitable!

What you're trying to do in your room is to absorb the mid and high
frequencies rather than reflect them back to the listener. If the mids
and highs are not reflected, that is effectively as if the walls weren't
there, thus acoustically enlarging the room. Removing the early
reflections will improve the stereo image by removing confusing
directional clues, which will be frequency dependant and cause
"wandering" images. Carpets, heavy blankets etc will absorb mid and high
frequencies well. In my own case, I used rockwool behind thin curtains,
as rockwool acoustic grade is an excellent mid/high absorber.

This then leaves the bass end. Here, sadly, there is no easy way, as
absorbing frequencies below a few hundred hertz requires a much greater
thickness of material than there is normally room for, especially in
your listening room. About the best you can do do is to build some
resistive absorbent bass traps to go in the corner opposite the
'speakers and along the back wall as you don't have room along the front
wall. My next project after I come back from my holidays is to build
some bass traps for a boomy corner. In US houses, the use of drywall
construction makes for quite good bass absorption as the walls are quite
lossy to low frequencies- almost like panel absorbers. With our solid
internal walls, our rooms are fairly tight to the bass, so we tend to
get more boom than they do.

I look forward to hearing the Lowther horns (in St Neots!) The last time
I heard Lowthers, I found the top rather lacking, but since then my own
top has rather diminished (and not just the hair) so they may sound OK
to me now. I remember they did have a very nice mid-range, speech was
pretty good, always a difficult test. At the time I bought IMF
transmission lines rather than the Lowthers because of the top.

S.

Rogers kit any good?
 

"Serge Auckland"

What you're trying to do in your room is to absorb the mid and high
frequencies rather than reflect them back to the listener. If the mids and
highs are not reflected, that is effectively as if the walls weren't
there, thus acoustically enlarging the room.


** Not merely enlarging.

You were precisely right the first time - it IS s as if there are simply
no walls.

With most good recordings - the listening room appears to instantly take
on the ambience characteristic of the original acoustic space (real or
artificial) where the recording was made.

Magical when it works.



Removing the early reflections will improve the stereo image by removing
confusing directional clues, which will be frequency dependant and cause
"wandering" images.


** Exactly correct.


Carpets, heavy blankets etc will absorb mid and high frequencies well.


** Well enough for a *very dramatic* improvement in the listener's
experience.

Speakers suddenly sound as detailed as good headphones do.


In my own case, I used rockwool behind thin curtains, as rockwool acoustic
grade is an excellent mid/high absorber.


** Same combo of materials as used to damp many large recoding studios.


This then leaves the bass end.


** Long as the floor and ceiling are not solid concrete slabs - things are
not too bad.

Those smart enough to use panel radiating speakers like the Quad ESL57 or
ESL 63 have NO idea what bass boom is- since such speakers do not readily
excite LF room modes.





.......... Phil

Rogers kit any good?
 

Yes, I've got a picture of a whole stack of them in some 'busines park
emporium' somewhere - quite flimsy by proper carpet standards, therefore
not too heavy to hang up and quite cheap. The patterns were very good
(Turkish/Persian style) and there were enough colour variations to make
them suitable!


Make that 'mental picture'...!!

I am now on a mission to find a carpet with an UNSUITABLE pattern.
Suggestions? :-)

Rogers kit any good?
 

"Serge Auckland" wrote


What you're trying to do in your room is to absorb the mid and high
frequencies rather than reflect them back to the listener. If the mids and
highs are not reflected, that is effectively as if the walls weren't
there, thus acoustically enlarging the room. Removing the early
reflections will improve the stereo image by removing confusing
directional clues, which will be frequency dependant and cause "wandering"
images. Carpets, heavy blankets etc will absorb mid and high frequencies
well. In my own case, I used rockwool behind thin curtains, as rockwool
acoustic grade is an excellent mid/high absorber.


That's all good stuff Serge - not all entirely new to me* but always
useful!!


This then leaves the bass end. Here, sadly, there is no easy way, as
absorbing frequencies below a few hundred hertz requires a much greater
thickness of material than there is normally room for, especially in your
listening room. About the best you can do do is to build some resistive
absorbent bass traps to go in the corner opposite the 'speakers and along
the back wall as you don't have room along the front wall. My next project
after I come back from my holidays is to build some bass traps for a boomy
corner. In US houses, the use of drywall construction makes for quite good
bass absorption as the walls are quite lossy to low frequencies- almost
like panel absorbers. With our solid internal walls, our rooms are fairly
tight to the bass, so we tend to get more boom than they do.


With my horns exiting at floor level, I'm kinda hoping the carpet's picking
up any 'surplus bass' and quenching/preventing standing waves, also we have
drywall partitioning here anyway.


I look forward to hearing the Lowther horns (in St Neots!) The last time I
heard Lowthers, I found the top rather lacking, but since then my own top
has rather diminished (and not just the hair) so they may sound OK to me
now. I remember they did have a very nice mid-range, speech was pretty
good, always a difficult test. At the time I bought IMF transmission lines
rather than the Lowthers because of the top.


Well, I'm hoping to have them squealing (first draft) at the weekend - right
now I'm 'glueing and screwing' and will be flushing down the internal panels
a bit later on:

http://www.apah69.dsl.pipex.com/show/glueing.JPG


(Actually, not quite true - right now I'm enjoying the best cheese on toast
in living memory and trying to type this with one greasy finger!!)

So, I'll give you a shout when there's a 'product' for you to hear - for
better or for worse!! :-)



* I have to say that - there's one or two here (Plowie, actually) don't
think I know my Helmholz resonators from Hertzian oscillators (or even
Herzegovinian hatstands) and they do keep trying to *lecture* me! ;-)

Rogers kit any good?
 

"Laurence Payne" lpayne1NOSPAM@dslDOTpipexDOTcom wrote in message
...
Yes, I've got a picture of a whole stack of them in some 'busines park
emporium' somewhere - quite flimsy by proper carpet standards, therefore
not too heavy to hang up and quite cheap. The patterns were very good
(Turkish/Persian style) and there were enough colour variations to make
them suitable!


Make that 'mental picture'...!!

I am now on a mission to find a carpet with an UNSUITABLE pattern.
Suggestions? :-)



Journey to St Neots and go in the furniture store in the High Street. (I
don't remember the name - we get our furniture from skips and/or John
Lewis*, but there is only one, IIRC) Find the salesman with the dodgy,
orange syrup and ask him for his personal recommendation...



*I tell a lie, I believe the fairly recent too pee sweet came from Marcus
Sparkus, but WTF do I know???

Rogers kit any good?
 

Keith G wrote:



With my horns exiting at floor level, I'm kinda hoping the carpet's picking
up any 'surplus bass' and quenching/preventing standing waves, also we have
drywall partitioning here anyway.

Solid concrete floors, even carpet covered, will do not a lot for the
bass, except reflect it, as solid concrete won't move much. Drywall
partitioning and ceiling will definitely help tame excessive bass, so in
your case, just reducing mid/high reflections will make a considerable
difference.


I look forward to hearing the Lowther horns (in St Neots!) The last time I
heard Lowthers, I found the top rather lacking, but since then my own top
has rather diminished (and not just the hair) so they may sound OK to me
now. I remember they did have a very nice mid-range, speech was pretty
good, always a difficult test. At the time I bought IMF transmission lines
rather than the Lowthers because of the top.


Well, I'm hoping to have them squealing (first draft) at the weekend - right
now I'm 'glueing and screwing' and will be flushing down the internal panels
a bit later on:

http://www.apah69.dsl.pipex.com/show/glueing.JPG

Impressive woodworking. Are these new enclosures or modified Jerichos.
If new, what design are they?

S.

Rogers kit any good?
 

Phil Allison wrote:
"Serge Auckland"
What you're trying to do in your room is to absorb the mid and high
frequencies rather than reflect them back to the listener. If the mids and
highs are not reflected, that is effectively as if the walls weren't
there, thus acoustically enlarging the room.


** Not merely enlarging.

You were precisely right the first time - it IS s as if there are simply
no walls.

With most good recordings - the listening room appears to instantly take
on the ambience characteristic of the original acoustic space (real or
artificial) where the recording was made.

Magical when it works.

Certainly did for me! Best £ 300 I ever spent.






In my own case, I used rockwool behind thin curtains, as rockwool acoustic
grade is an excellent mid/high absorber.


** Same combo of materials as used to damp many large recoding studios.

In my youth I designed several broadcasting studios and listening rooms,
just never applied it to my own home before.


This then leaves the bass end.


** Long as the floor and ceiling are not solid concrete slabs - things are
not too bad.

I agree, but many if not most British houses built since the '60s have
solid concrete slab floors and solid brick partition walls downstairs.
Only the ceiling is dry wall, so rooms do tend to boom a bit.

S.

Rogers kit any good?
 

"Serge Auckland" wrote


I agree, but many if not most British houses built since the '60s have
solid concrete slab floors and solid brick partition walls downstairs.
Only the ceiling is dry wall, so rooms do tend to boom a bit.


Having lived with wooden board, suspended floors in the past, take it from
me they are *total* pain in the creaking arse - and that's not just from a
skipping needle POV!!

(And the unsurpassable *poultice* of chipboard sheet flooring just doesn't
bear thinking about!!)


(Your ceiling is dry *wall*...?? ;-)

Rogers kit any good?
 

"Serge Auckland" wrote in message
...
Keith G wrote:



With my horns exiting at floor level, I'm kinda hoping the carpet's
picking up any 'surplus bass' and quenching/preventing standing waves,
also we have drywall partitioning here anyway.

Solid concrete floors, even carpet covered, will do not a lot for the
bass, except reflect it, as solid concrete won't move much. Drywall
partitioning and ceiling will definitely help tame excessive bass, so in
your case, just reducing mid/high reflections will make a considerable
difference.


It's going to be interesting to find out, but the speakers need to be
settled in first.




I look forward to hearing the Lowther horns (in St Neots!) The last time
I heard Lowthers, I found the top rather lacking, but since then my own
top has rather diminished (and not just the hair) so they may sound OK
to me now. I remember they did have a very nice mid-range, speech was
pretty good, always a difficult test. At the time I bought IMF
transmission lines rather than the Lowthers because of the top.


Well, I'm hoping to have them squealing (first draft) at the weekend -
right now I'm 'glueing and screwing' and will be flushing down the
internal panels a bit later on:

http://www.apah69.dsl.pipex.com/show/glueing.JPG

Impressive woodworking. Are these new enclosures or modified Jerichos. If
new, what design are they?



Lowther's 'Fidelio'....

http://www.lowtherloudspeakers.co.uk...gs/fiddwg.html

....called 'Infidelio' by me 'cos I refuse to buy a sodding great 8' x 4' of
22mm MDF just for the two front baffles!! (I'll make it up later with a
secondary lamination of possibly veneered hardboard or summat, allover glued
on the fronts!)

Take it from the top he

http://www.apah69.dsl.pipex.com/infi...infidelios.htm

All very simplistic stuff, but I get a lot of mail from people who like the
webpages that way!! ;-)

Now I gotta go and glue the second speaker - talk about a strong case for
going *mono*...!!!